any ideas for keeping my chickens from freezing this winter?

It looks like we are headed for a chicken-killer winter, and I don't have faith out hen house will keep everyone warm enough. Its just an open face goat shed with 2 chain link dog kennels attached out front with chicken wire wrapping it. Id like to beef it up so everyone can snuggle together and stay warm, but with it being so open...I'm kinda stumped at what to do. Any ideas? I'd thought about getting straw bales and walling it on the inside, but I don't know if that's gonna cut it?

I would add some boarded walls, (I don't know what your area looks like though, so hard to give advice)...straw bales is a definate step in the right direction. As long as you keep the winds off them, they will snuggle up and stay warm.